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Fexofenadine is used for relief from physical symptoms associated with seasonal allergic rhinitis and for treatment of hives, including chronic urticaria. [12] It does not cure, but rather prevents the aggravation of allergic rhinitis and chronic idiopathic urticaria, and reduces the severity of the symptoms associated with those conditions, providing relief from repeated sneezing, runny nose ...
It contains fexofenadine, as the hydrochloride, an antihistamine; and pseudoephedrine, as the hydrochloride, a nasal decongestant. [2] In 2021, it was the 279th most commonly prescribed medication in the United States, with more than 800,000 prescriptions. [5] [6]
Quifenadine (Russian: хифенадин, trade name: Phencarol, Фенкарол) is a 2nd generation antihistamine drug, marketed mainly in post-Soviet countries. [2] [3] Chemically, it is a quinuclidine derivative.
In one study, a more acidic pH of 5.0 resulted in a half-life of 3.0 to 6.4 hours, whereas a more alkaline pH of 8.0 resulted in a half-life of 9.2 to 16.0 hours. [11] Substances that influence urinary acidity and are known to affect the excretion of amphetamine derivatives include urinary acidifying agents like ascorbic acid and ammonium ...
As the stomach has an aqueous environment, it is the first place where the pill can dissolve. The rate of dissolution is a key element in controlling the duration of a drug's effect. For this reason, different forms of the same medication can have the same active ingredients but different dissolution rates.
Terfenadine acts as a peripherally-selective antihistamine, or antagonist of the histamine H 1 receptor. [3] It is a prodrug, generally completely metabolized to the active form fexofenadine in the liver by the enzyme cytochrome P450 3A4.
The time to reach maximum concentration (T max) of hydroxyzine is about 2.0 hours in both adults and children and its elimination half-life is around 20.0 hours in adults (mean age 29.3 years) and 7.1 hours in children. [5] [6] Its elimination half-life is shorter in children compared to adults. [5]
A subsequent 1990 study found that the elimination half-life of diphenhydramine was 5.4 hours in children, 9.2 hours in young adults, and 13.5 hours in the elderly. [7] A 1998 study found a half-life of 4.1 ± 0.3 hours in young men, 7.4 ± 3.0 hours in elderly men, 4.4 ± 0.3 hours in young women, and 4.9 ± 0.6 hours in elderly women. [82]
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